okay, here we go
The basic idea for duplication is that the mixing board has three stereo outputs (not including the headphone output jack)
and the input could just be from any channel (computer, cd, another tape, DVD, VHS, etc)
My current set-up isn't for mass tape duplication right now, but it is easily changed with a few wires (and grabbing another tape deck to add to the stack)
I'd love to see some other set-ups posted here, or in a new thread.
take care